Patent US2029720A successfully refreshed from Google Patents.
US2029720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audible electric signal
Assignee: Individual
•
Filing: 1934-07-09
•
Granted: 1936-02-04
•
Expires: 1954-07-09
Abstract
No abstract record available.
Inventors
- 👤 Ignell Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/062; G10K1/066
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-02-03 | 1939-08-05 | 1940-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-02-03 | 1943-08-05 | 1944-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-02-03 | 1947-08-05 | 1948-02-04 | $7700.00 | Window Closed / Lapsed |